nsaids, like celebrex, increase the chance of serious skin or allergic reactions, or stomach and intestine problems, such as bleeding and ulcers, which can occur without warning and may cause death. patients also taking aspirin and the elderly are at increased risk for stomach bleeding and ulcers. don't takeebrex if you have bleeding in the stomach or inteste, or had an asthma attack, hives, other allergies to aspirin, nsaids or sulfonamides. get help right away if you have swelling of the face or thro, or trouble breathing. tell your doctor your medical history. and ask your doctor about celebrex. for a body in motion.